The free electron concentration profile $n(x)$ in a doped semiconductor at equilibrium is shown in the figure, where the points $\mathrm{A}, \mathrm{B}$, and $\mathrm{C}$ mark three different positions. Which of the following statements is/are true?
- For $x$ between $\mathrm{B}$ and $\mathrm{C}$, the electron diffusion current is directed from $\mathrm{C}$ to $\mathrm{B}$.
- For $x$ between $\mathrm{B}$ and $\mathrm{A}$, the electron drift current is directed from $\mathrm{B}$ to $\mathrm{A}$.
- For $x$ between $\mathrm{B}$ and $\mathrm{C}$, the electric field is directed from $\mathrm{B}$ to $\mathrm{C}$.
- For $x$ between $\mathrm{B}$ and $\mathrm{A}$, the electric field is directed from $\mathrm{A}$ to $\mathrm{B}$.